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Aquatic Sciences

, Volume 72, Issue 2, pp 165–178 | Cite as

Fishing effects on age and spatial structures undermine population stability of fishes

  • Chih-hao HsiehEmail author
  • Atsushi Yamauchi
  • Takefumi Nakazawa
  • Wei-Fen Wang
Overview

Abstract

Overfishing has caused dramatic changes in structures of exploited populations as well as ecosystems. In this article, we focus on fishing effects on age (size) and spatial structures of exploited fishes. Accumulating evidence has shown that large and experienced spawning individuals are able to produce higher quality and quantity of eggs, known as maternal effects, and that individuals of different age classes tend to spawn in different locations and times. These behaviors are associated with a healthy age structure and contribute to bet-hedging capacity that is important in smoothing out short-term environmental variability. Here, we document a widespread phenomenon of age (size)-truncation of exploited populations driven by size-selective fishery removals. Such size-selective fishing may have evolutionary consequence and may be difficult to reverse. In addition, fishing often reduces population spatial heterogeneity that also contributes importantly to bet-hedging. We review studies showing that the effects of age truncation and reduction of spatial heterogeneity have reduced resilience and elevated the fluctuation amplitude of exploited populations facing a changing environment. Recent analyses indicated that fish populations often exhibit nonlinear nature and have potential to shift dramatically in a short time. All the evidence suggests that fishing, by altering age or spatial structures, may make exploited fishes, more prone to catastrophic shifts. Therefore, to achieve sustainable fisheries, management should conserve the age and spatial structure in addition to viable spawning biomass.

Keywords

Age (size) composition Spatial heterogeneity Maternal effects Bet-hedging Fisheries management Nonlinear catastrophic shifts 

Notes

Acknowledgments

This work is supported by NSC to CH and WW, the postdoctoral fellowship from NTU and JSPS to TN, and JSTA and the Global COE Program A06, Kyoto University to AY.

Supplementary material

27_2009_122_MOESM1_ESM.pdf (78 kb)
Appendixes 1 and 2 (PDF 77 kb)

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Copyright information

© Birkhäuser Verlag, Basel/Switzerland 2009

Authors and Affiliations

  • Chih-hao Hsieh
    • 1
    Email author
  • Atsushi Yamauchi
    • 2
    • 3
  • Takefumi Nakazawa
    • 1
    • 2
  • Wei-Fen Wang
    • 1
  1. 1.Institute of Oceanography and Institute of Evolutionary BiologyNational Taiwan UniversityTaipeiTaiwan
  2. 2.Center for Ecological ResearchKyoto UniversityOtsuJapan
  3. 3.PRESTOJapan Science and Technology AgencyKawaguchiJapan

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